Wireless communications devices supporting WiFi and LTE communications and methods for transmission control thereof

ABSTRACT

A mobile communications device supporting operation on a first wireless technology and a second wireless technology with a wireless module and a controller module is provided. The wireless module performs wireless transceiving to and from a first base station of a first wireless technology and a second base station of a second wireless technology. The controller module transmits a control message prior to the starting of a uplink transmission period of the first wireless technology via the wireless module to occupy the uplink transmission period of the first wireless technology so as to allow transmission of signals of the second wireless technology during the uplink transmission period of the first wireless technology, wherein the first wireless technology is a long term evolution (LTE) technology and the second wireless technology is a WiFi technology.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No.61/863,699, filed on Aug. 8, 2013, the entirety of which is incorporatedby reference herein.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention generally relates to transmission control in a wirelesscommunications device, and more particularly, to wireless communicationsdevices and methods for transmission control in a wirelesscommunications device associated with different radio accesstechnologies (RATs).

2. Description of the Related Art

In a typical mobile communications environment, user equipment (UE) maycommunicate voice and/or data signals with one or more service networksvia cellular stations of the service networks. The wirelesscommunications between the UE and the service networks may be incompliance with various radio access technologies (RATs), such as theGlobal System for Mobile communications (GSM) technology, General PacketRadio Service (GPRS) technology, Enhanced Data rates for GlobalEvolution (EDGE) technology, Wideband Code Division Multiple Access(WCDMA) technology, Code Division Multiple Access 2000 (CDMA 2000)technology, Time Division-Synchronous Code Division Multiple Access(TD-SCDMA) technology, Worldwide Interoperability for Microwave Access(WiMAX) technology, Long Term Evolution (LTE) technology, UniversalMobile Telecommunications System (UMTS) technology, short range wirelesstechnology such as WLAN (e.g., WiFi) technology, Bluetooth technology,and others.

Currently, the UE may have multiple wireless interfaces for differentRATs. For example, the UE may have a WiFi interface for performing WiFicommunication and a LTE interface for performing LTE communication. Inmany situations it is necessary to operate two or more wirelessinterfaces simultaneously. Depending on the operating frequencies of thewireless interfaces, the UE can experience interference due to thesimultaneous operation of the wireless interfaces. Specifically, thetransmitting signals on one interface results in interference beingexperienced in the reception of signals on the other interface. Forexample, for a UE having both a WiFi interface and a LTE interface forsimultaneously supporting WiFi and LTE communications, a WiFi station(STA) may not able to receive data from a WiFi access point (AP) duringthe LTE uplink transmission period due to the LTE uplink interference sothat the WiFi data rate may be dropped. Therefore, the interferencebetween these two technologies operating in the same UE createschallenges for the coexistence of the corresponding wireless interfacesof that UE.

BRIEF SUMMARY OF THE INVENTION

Accordingly, embodiments of the invention provide apparatuses andmethods for transmission control in a mobile communications deviceassociated with different Radio Access Technologies (RATs). In oneaspect of the invention, a mobile communications device supportingoperation on a first wireless technology and a second wirelesstechnology with a wireless module and a controller module is provided.The wireless module performs wireless transceiving to and from a firstbase station of a first wireless technology and a second base station ofa second wireless technology. The controller module transmits a controlmessage prior to the starting of a uplink transmission period of thefirst wireless technology via the wireless module to occupy the uplinktransmission period of the first wireless technology so as to allowtransmission of signals of the second wireless technology during theuplink transmission period of the first wireless technology, wherein thefirst wireless technology is a long term evolution (LTE) technology andthe second wireless technology is a WiFi technology.

In another aspect of the invention, a method for transmission control ina mobile communications device supporting WiFi communication and LTEcommunication is provided. The method comprises the steps oftransmitting a control signal prior to the starting of an uplink periodof the LTE communication to occupy the uplink transmission period of theLTE communication and allowing the WiFi transmission to be performedduring the occupied uplink transmission period of the LTE communication.

Other aspects and features of the present invention will become apparentto those with ordinarily skill in the art upon review of the followingdescriptions of specific embodiments of apparatuses and methods fortransmission control in a wireless communications system supporting WiFiand LTE communications.

BRIEF DESCRIPTION OF DRAWINGS

The invention can be more fully understood by reading the subsequentdetailed description and examples with references made to theaccompanying drawings, wherein:

FIG. 1 is a block diagram illustrating a mobile communicationsenvironment according to an embodiment of the invention;

FIG. 2 is a flow chart illustrating a method for transmission control ina mobile communications device according to an embodiment of theinvention;

FIG. 3 is a timing diagram illustrating timing for transmission controlin a mobile communications device supporting the WiFi communication andthe LTE communication according to an embodiment of the invention;

FIG. 4 is a flow chart illustrating a method for transmission control ina mobile communications device according to another embodiment of theinvention;

FIG. 5 is a flow chart illustrating a method for transmission control ina mobile communications device according to another embodiment of theinvention.

FIG. 6 is a schematic diagram illustrating an example of counter usageaccording to an embodiment of the invention; and

FIGS. 7A to 7E are timing diagrams illustrating timing for transmissioncontrol in a mobile communications device supporting the WiFicommunication and the LTE communication according to embodiments of theinvention.

DETAILED DESCRIPTION OF THE INVENTION

The following description is of the best-contemplated mode of carryingout the invention. This description is made for the purpose ofillustrating the general principles of the invention and should not betaken in a limiting sense. The 3GPP specifications are used to teach thespirit of the invention, and the invention is not limited thereto.

Apparatuses and methods for transmission control in a mobilecommunications device associated with different Radio AccessTechnologies (RATs) are provided.

FIG. 1 is a block diagram illustrating a mobile communicationsenvironment according to an embodiment of the invention. In the mobilecommunications environment 10, the mobile communications device 100 iswirelessly connected to a first base station 210 of the service network200 of a first wireless technology and a second base station 310 of theservice network 300 of a second wireless technology for obtainingwireless services. The first wireless technology can be a cellulartechnology such as LTE or UMTS. The second wireless technology can be aWiFi technology such as IEEE 802.11 or a personal area networktechnology such as Bluetooth. Generally, the base station 210 may bereferred to as a base station, a cell or an access station, or may bereferred to as an Home Node-B (HNB) in a WCDMA network or a Homee-Node-B (HeNB) in an LTE network, which is controlled by a control node(not shown) to provide the functionality of wireless transceiving forthe service network 200 (e.g. the LTE network). Similarly, the basestation 310 may be referred to as a base station, a cell or an accessstation, or may be referred to as an access point (AP) in a WLANnetwork, to provide the functionality of wireless transceiving for theservice network 300 (e.g. the WiFi network).

In this embodiment, the base station 210 is an LTE cellular station (orcalled an LTE cell) which supports the LTE technology and the basestation 310 is a WiFi AP which supports the WiFi technology. The mobilecommunications device 100 is referred to as a user equipment (UE) or amobile station (MS), supporting the abovementioned RATs, and can be adevice such as a mobile phone, a computer system, etc. The mobilecommunications device 100 comprises a wireless module 110 for performingthe functionality of wireless transmissions and receptions to and fromthe LTE cellular station 210 or the WiFi AP 310. The methods can be usedin wireless communication systems with one or more mobile communicationsdevices 100, wherein the mobile communications devices may comprise afirst transceiver for the first wireless technology and a secondtransceiver for the second wireless technology. For example, in thisembodiment, the first transceiver can be a LTE transceiver 112 and thesecond transceiver can be a WiFi transceiver 114 which are configured toprovide WiFi AP functionality or configured to function as WiFi Stations(STA), but the invention is not limited thereto.

To further clarify, the wireless module 110 may comprise a baseband unit(not shown) and a radio frequency (RF) unit (not shown). The basebandunit may contain multiple hardware devices to perform baseband signalprocessing, including analog to digital conversion (ADC)/digital toanalog conversion (DAC), gain adjusting, modulation/demodulation,encoding/decoding, and so on. The RF unit may receive RF wirelesssignals, convert the received RF wireless signals to baseband signals,which are processed by the baseband unit, or receive baseband signalsfrom the baseband unit and convert the received baseband signals to RFwireless signals, which are later transmitted. The RF unit may alsocontain multiple hardware devices to perform radio frequency conversion.For example, the RF unit may comprise a mixer to multiply the basebandsignals with a carrier oscillated in the radio frequency of the wirelesscommunications system, wherein the radio frequency may be 900 MHz, 1900MHz, or 2100 MHz utilized in WCDMA systems, or may be 900 MHz, 2100 MHz,or 2.6 GHz utilized in LTE systems, or others depending on the radioaccess technology (RAT) in use.

Also, the mobile communications device 100 further comprises acontroller module 120 for controlling the operation of the wirelessmodule 110 and other functional components, such as a display unitand/or keypad serving as the MMI (man-machine interface), a storage unitstoring the program codes of applications or communication protocols, orothers. In one embodiment, the mobile communications device 100 may be aUE in compliance with both of the specifications of the WiFi and LTEcommunication protocols, and the invention is not limited thereto.

To be more specific, the controller module 120 controls the wirelessmodule 110 for performing a data transmission operation with the servicenetwork 200 and/or the service network 300 via the LTE cellular station210 and/or the WiFi AP 310, respectively. The controller module 120 mayperform a uplink transmission for the LTE communication to transmit datato the LTE cellular station 210 during a uplink transmission period ofthe LTE communication or a downlink transmission for the LTEcommunication to receive data from the LTE cellular station 210 during adownlink transmission period of the LTE communication via the LTEtransceiver 112 of the wireless module 110. The controller module 120may also perform a WiFi transmission to transmit signals or data packetsto a receiving end (e.g. the WiFi AP 310 or other WiFi STAs) in theservice network 300 via the WiFi transceiver 114 of the wireless module110 and then should receive a replied acknowledge (ACK) packet/messagefrom the receiving end after the signals or data packets have beentransmitted. The controller module 120 may also perform a WiFi receptionto receive signals or data packets from a transmission end (e.g. theWiFi AP 310 or other WiFi STAs) in the service network 300 via the WiFitransceiver 114 and then should reply an ACK packet/message to thetransmission end after the signals or data packets have been received.

FIG. 2 is a flow chart illustrating a method for transmission control ina mobile communications device according to an embodiment of theinvention. In this embodiment, the mobile communications device iscamped on a first cellular station of the first service network and isalso capable of camping on a second cellular station of a second servicenetwork, wherein the first service network supports the LTE technologyand the second service network supports the WiFi technology. To begin,the controller module 120 transmits a control signal prior to thestarting of an uplink (UL) transmission period of the LTE communicationto occupy the UL period of the LTE communication (step S202). Forexample, in one embodiment, the controller module 120 may send aClear-To-Send-to-self (CTS2Self) control signal before the start pointof the LTE UL period to reserve the medium to occupy the UL period ofthe LTE communication for WiFi data transmission via the WiFitransceiver 114 of the wireless module 110.

After the UL period of the LTE communication has been occupied, thecontroller module 120 allows the WiFi transmission to be performedduring the occupied UL period of the LTE communication (step S204). Ifthere is any WiFi data requiring to be transmitted, the WiFitransmission can be performed during the occupied UL period of the LTEcommunication. When the WiFi transmission is to be performed, the WiFitransmission is further rescheduled by the controller module 120 to endthe WiFi transmission prior to the starting of a downlink (DL)transmission period of the LTE communication so as to receive an ACKsignal for the WiFi reception within the DL period of the LTEcommunication (step S206). As the control signal CTS2Self is sent beforethe start point of the UL period of the LTE communication to protectWiFi channel and the ACK signal for the WiFi reception is received inthe DL transmission period of the LTE communication rather than the ULtransmission period of the LTE communication, the data rate for the WiFiAP will not be dropped. For example, the controller module 120 can set anetwork allocation vector (NAV) parameter in the CTS2Self message toindicate the time interval for which the WiFi communications should notbe initiated and send the CTS2Self message to other WiFi devices via theWiFi transceiver 114. Other WiFi devices that receive the CTS2SELFmessage from the mobile communications device 100 do not initiate WiFicommunications. This can free the communication medium from WiFicommunications, thus preventing interference between LTE communicationsand WiFi communications during the LTE allocated communication timeinterval

For example, please refer to FIG. 3, which is a timing diagramillustrating timing for transmission control in a mobile communicationsdevice supporting the WiFi communication and the LTE communicationaccording to an embodiment of the invention. As shown in FIG. 3, timedurations T0 to T3 are illustrated, wherein the time durations T0 and T2represent the DL periods of the LTE communication (hereinafter alsoreferred to as the LTE DL period) while the time durations T1 and T3represent the UL periods of the LTE communication (hereinafter alsoreferred to as the LTE UL period). During the LTE DL period T0, the WiFitransceiver 114 is free to perform the WiFi transmission or WiFireception of WiFi signals/packets. To avoid interference from thetransmission of the LTE UL period to the WiFi transmission, a controlsignal CTS2Self is transmitted prior to starting (e.g. at the start timepoint S1) of the LTE UL period T1, as shown in 310. By transmitting thecontrol signal CTS2Self, the LTE UL period T1 can be occupied for datatransmission by the WiFi transceiver. Therefore, during the timeduration T1 of the LTE UL period, if there is any data waiting to betransmitted, the WiFi transceiver can transmit the WiFi packets (WiFiTX), as shown in 320. To be more specific, in some embodiments, the WiFitransceiver can be operated in a specific mode, a WiFi TX alignmentmode, during which the WiFi transceiver can transmit the WiFi packets tothe WiFi AP. Then, the WiFi transceiver further reschedules the WiFitransmission to end the WiFi transmission before or at the starting(e.g. the start time point S2) of the LTE DL period T2 of the LTEcommunication so as to receive an acknowledge signal ACK for the WiFireception within the LTE DL period T2, as shown in 330. Because the WiFitransmission is rescheduled to be ended before the starting (e.g. thestart time point S2) of the LTE DL period, the acknowledge signal ACKfor the WiFi reception can be received within the subsequent LTE DLperiod T2. Similarly, by transmitting the control signal CTS2Self beforethe start of the LTE UL period T3, the LTE UL period T3 can be occupiedfor data transmission by the WiFi transceiver again. During the timeduration T3 of the LTE UL period, if there is any WiFi data waiting tobe transmitted, the WiFi transceiver can transmit the WiFi packets. Tobe more specific, in some embodiments, the WiFi transceiver can beoperated in the specific mode, i.e. the WiFi TX alignment mode, totransmit the WiFi packets to the WiFi AP.

FIG. 4 is a flow chart illustrating a method for transmission control ina mobile communications device according to another embodiment of theinvention. In this embodiment, the mobile communications device iscamped on a first cellular station of the first service network and isalso capable of camping on a second cellular station of a second servicenetwork, wherein the first service network supports the long termevolution (LTE) technology and the second service network supports theWiFi technology. To begin, the mobile communications device sends aclear-to-send-to-self (CTS2Self) packet before the start point of LTE ULperiod (step S402) to occupy the LTE UL period of the LTE communication.After the CTS2Self packet has been sent, the mobile communicationsdevice further determines whether any WiFi data waits to be sent duringthe LTE UL period (step S404). If no WiFi data waits to be sent duringthe LTE UL period (No in step S404), the flow ends. If at least one WiFidata waits to be sent during the LTE UL period (Yes in step S404), theWiFi transceiver transmits packets and ends the transmission before thestart of LTE DL period (step S406). Then, the mobile communicationsdevice receives a WiFi ACK for the WiFi reception within the LTE DLperiod (step S408).

In some embodiments, the controller module 120 may reschedule the WiFitransmission to end the WiFi transmission before or at the starting ofthe LTE DL period by adjusting a packet start time or a transmissiondata rate for the WiFi transmission according to a packet length of thepacket being transmitted. In one embodiment, the waiting time orso-called the back-off time is adjusted if the transmission rate isdetermined. In another embodiment, the transmission rate is adjusted toextend the packet transmission time if the back-off time is determined.

Referring to FIG. 1, a first counter RW_orig and a second counterRW_TX_align are provided, wherein the first counter RW_orig is arrangedfor counting a time for transmission of signals of the second wirelesstechnology during the downlink transmission period of the first wirelesstechnology and a second counter for counting a time for transmission ofsignals of the second wireless technology during the uplink transmissionperiod of the first wireless technology, and the transmission of signalsof the second wireless technology can be performed during either thedownlink transmission period or the uplink transmission period of thefirst wireless technology based on counter values of the first andsecond counters. To be more specific, the transmission of signals of thesecond wireless technology can be performed during the downlinktransmission period of the first wireless technology based on thecounter value of the first counter, wherein the second transceiver isfree to transmit or receive signals or data during this period. Thetransmission of signals of the second wireless technology can also beperformed during the uplink transmission period of the first wirelesstechnology based on the counter value of the second counter, wherein thesecond transceiver can only transmit signals or data or do nothingduring this period.

FIG. 5 is a flow chart illustrating a method for transmission control ina mobile communications device according to another embodiment of theinvention.

In step S502, at the start point of every LTE DL period, the controllermodule 120 sets the first counter RW_orig to be a value equal toLTE_DL_TIME, wherein the value LTE_DL_TIME indicates a time length forthe LTE DL period. For example, if the value LTE_DL_TIME is set to be3200 us and the value LTE_UL_TIME is set to be 1800 us, the firstcounter RW_orig is counting down from 3200 us to zero with time duringthe LTE DL period while the second counter RW_TX_align is counting downfrom 1800 us to zero with time during the LTE UL period, as shown inFIG. 6.

In step S504, the controller module 120 further determines whether thecounter value of the first counter RW_orig is less than or equal to apredefined value SILENCE_TIME.

If the counter value of the first counter RW_orig is greater than thevalue SILENCE_TIME (No in step S504), Wi-Fi transceiver controlled bythe controller module 120 is free to perform WiFi transmission/reception(step S506).

If the counter value of the first counter RW_orig is less than or equalto the value SILENCE_TIME (Yes in step S504), Wi-Fi transceivertransmits a control signal clear-to-send-to-self (CTS2Self) to the WiFiAP or other WiFi devices to occupy the LTE UL period (step S508).

Next, at the start point of every LTE DL period, the controller module120 sets the second counter RW_TX_align to be a value equal toLTE_UL_TIME, wherein the value LTE_UL_TIME indicates a total time lengthfor the LTE UL period (step S510).

During each LTE UL period, the controller module 120 then determineswhether the Wi-Fi transceiver requests to perform a WiFi transmission totransmit WiFi data (step S512).

If the Wi-Fi transceiver does not request to transmit WiFi data (No instep S512), the controller module 120 waits for the start point of nextLTE DL period (step S514) and return to S502 to reset the first counterRW_orig to be the value equal to LTE_DL_TIME.

If the Wi-Fi transceiver requests to transmit WiFi data (Yes in stepS512), the controller module 120 further determines a starting time ofthe WiFi transmission and a data transmission rate for the WiFitransmission according to a packet length of the WiFi packet to be sentto make sure the Wi-Fi transmission ends at the start point of the LTEDL period (step S516). Thus, the controller module 120 can then receivea replied ACK packet/message from the receiving end after the WiFitransmission has been finished within the LTE DL period and thenperforms the WiFi reception as well during the LTE DL period.

Several embodiments are further provided to make sure response-ACK toactivate the WiFi reception falls in LTE DL period. FIGS. 7A to 7E aretiming diagrams illustrating timing for transmission control in a mobilecommunications device supporting the WiFi communication and the LTEcommunication according to embodiments of the invention.

In the first embodiment shown in FIG. 7A, the controller module 120 mayreschedule the WiFi transmission to end the WiFi transmission before orat the starting of the LTE DL period by using “padding delimiter” toextend the packet transmission time so as to make sure ACK falls in LTEDL period. For example, in this embodiment, it is appended NULLdelimiter 720 to extend the packet transmission time if the data packet710 being transmitted cannot end on the start of the LTE DL period.

In the second embodiment shown in FIG. 7B, the controller module 120 mayreschedule the WiFi transmission to end the WiFi transmission before orat the starting of the LTE DL period by configuring a Quiet durationwith a duration data for reserving the deferred starting time forfurther transmission to make sure ACK falls in LTE DL period. The Quietelement defines an interval during which no transmission shall occur inthe current channel. In this embodiment, in step S1, Beacon is sendingwith Quiet duration reserving the deferred starting time for futuretransmissions during the LTE DL period T0. In step S2, during the LTE ULperiod T1, if there is any data waiting to be sent, the controllermodule 120 transmits packets and ends the transmissions before the startof the LTE DL period via the WiFi transceiver 114 of the wireless module110. In step S3, ACK to activate the WiFi reception can be received bythe controller module 120 within LTE DL period T2.

In the third embodiment shown in FIG. 7C, the controller module 120 mayreschedule the WiFi transmission to end the WiFi transmission before orat the starting of the LTE DL period by sending a TxOP reservationmessage to make sure ACK falls in LTE DL period. In this embodiment, instep S1, A TxOP holder sending QoS Null packet with a duration field (noACK) with its duration longer than specified the total time for the nexttransmission before the start of LTE UL period T1. In step S2, duringthe LTE UL period T1, if there is any data waiting to be sent, thecontroller module 120 transmits packets and ends the transmissionsbefore the start of the LTE DL period via the WiFi transceiver 114 ofthe wireless module 110. In step S3, WiFi ACK RX can be received by thecontroller module 120 within LTE DL period T2.

In the fourth embodiment shown in FIG. 7D, the control module 120transceiver may reschedule the WiFi transmission to end the WiFitransmission before or at the starting of the LTE DL period by sending aphysical layer control message, e.g. a physical layer convergenceprotocol (PLCP) header length, to make sure ACK falls in LTE DL period.A length field include in the complementary code keying (CCK) PLCPheader indicates the time duration to be occupied by the packet. AnyWiFi device which supports the WiFi transmission receives a valid CCKPLCP header will keep in receiving mode/silence until the specified time(length) expired. Therefore, the CCK PLCP header can be utilize to keepother Wi-Fi devices quiet, reserving time for other co-located radiosystems, or deferring starting time for the next transmission. In thisembodiment, in step S1, A CCK QoS Null packet with a duration field (noACK) with its PLCP header length field specified the deferred startingtime for the next transmission is transmitted before the start of LTE ULperiod T1. In step S2, during the LTE UL period T1, if there is any datawaiting to be sent, the controller module 120 transmits packets and endsthe transmissions before the start of the LTE DL period via the WiFitransceiver 114 of the wireless module 110. In step S3, WiFi ACK RX canbe received by the controller module 120 within LTE DL period T2.

In the fifth embodiment shown in FIG. 7E, the controller module 120 mayreschedule the WiFi transmission to end the WiFi transmission before orat the starting of the LTE DL period by using a Reduced-InterFrame Space(RIFS) protection message to make sure ACK falls in LTE DL period. Inthis embodiment, in step S1, QoS Null packets (no ACK) are sent withRIFS burst until the deferred starting time for the next transmissionsbefore the start of LTE UL period T1. In step S2, during the LTE ULperiod T1, if there is any data waiting to be sent, the controllermodule 120 transmits packets and ends the transmissions before the startof the LTE DL period T2 via the WiFi transceiver 114 of the wirelessmodule 110. In step S3, WiFi ACK RX can be received by the controllermodule 120 within LTE DL period T2.

Therefore, according to the mobile communications devices supportingWiFi communication and LTE communication and related methods fortransmission control of the invention, by applying WiFi transmissionalignment control which transmits a control message prior to thestarting of a uplink transmission period of the LTE communication tooccupy the uplink transmission period of the LTE communication andrearranges the WiFi transmission to end it prior to the starting of thedownlink transmission period of the LTE communication, the WiFitransmission can be performed during the uplink transmission period ofthe LTE communication and the ACK for the WiFi reception can be receivedonly within the downlink transmission period of the LTE communication sothat WiFi transmission throughput can be maximized with simultaneous LTEtraffic, thereby minimizing WiFi transmission performance degradationand providing more WiFi reception opportunities.

The method for transmission control may be implemented in program codestored in a machine-readable storage medium, such as a magnetic tape,semiconductor, magnetic disk, optical disc (e.g., CD-ROM, DVD-ROM,etc.), or others, and when loaded and executed by a processing unit, amicro-control unit (MCU), or the controller module 120 in FIG. 1, theprogram code may perform the method for transmission control in a mobilecommunications device supporting WiFi communication and LTEcommunication. In addition, the method may be applied to any mobilecommunications device supporting the WiFi technology and/or the LTEtechnology.

While the invention has been described by way of example and in terms ofpreferred embodiment, it is to be understood that the invention is notlimited thereto. Those who are skilled in this technology can still makevarious alterations and modifications without departing from the scopeand spirit of this invention. Therefore, the scope of the presentinvention shall be defined and protected by the following claims andtheir equivalents.

What is claimed is:
 1. A mobile communications device supportingoperation on a first wireless technology and a second wirelesstechnology, comprising: a wireless module performing wirelesstransceiving to and from a first base station of a first wirelesstechnology and a second base station of a second wireless technology,wherein the first wireless technology is a long term evolution (LTE)technology and the second wireless technology is a WiFi technology; anda controller module, transmitting a control message prior to thestarting of a uplink transmission period of the first wirelesstechnology via the wireless module to occupy the uplink transmissionperiod of the first wireless technology so as to allow transmission ofsignals of the second wireless technology during the uplink transmissionperiod of the first wireless technology, wherein the controller modulefurther rearranges the transmission of signals of the second wirelesstechnology to end the transmission of signals of the second wirelesstechnology prior to the starting of a downlink transmission period ofthe first wireless technology so as to receive an acknowledge (ACK) toactivate the reception of signals of the second wireless technologyduring the downlink transmission period of the first wireless technologyvia the wireless module.
 2. The mobile communications device of claim 1,further comprising a first counter for counting a time for thetransmission of signals of the second wireless technology during thedownlink transmission period of the first wireless technology and asecond counter for counting a time for the transmission of signals ofthe second wireless technology during the uplink transmission period ofthe first wireless technology, and the transmission of signals of thesecond wireless technology is performed during the downlink transmissionperiod or the uplink transmission period of the first wirelesstechnology based on counter values of the first and second counters. 3.The mobile communications device of claim 1, wherein the controllermodule further rearranges the transmission of signals of the secondwireless technology to end the transmission of signals of the secondwireless technology prior to the starting of the downlink transmissionperiod of the first wireless technology by adjusting a packet start timeor a transmission data rate for the transmission of signals of thesecond wireless technology according to a packet length of the signalsof the second wireless technology.
 4. The mobile communications deviceof claim 1, wherein the controller module further rearranges thetransmission of signals of the second wireless technology to end thetransmission of signals of the second wireless technology prior to thestarting of the downlink transmission period of the first wirelesstechnology by extending a packet transmission time for the transmissionof signals of the second wireless technology using padding delimiters.5. The mobile communications device of claim 1, wherein the controllermodule further rearranges the transmission of signals of the secondwireless technology to end the transmission of signals of the secondwireless technology prior to the starting of the downlink transmissionperiod of the first wireless technology by configuring a Quiet durationwith a duration data for reserving the deferred starting time forfurther transmission.
 6. The mobile communications device of claim 1,wherein the controller module further rearranges the transmission ofsignals of the second wireless technology to end the transmission ofsignals of the second wireless technology prior to the starting of thedownlink transmission period of the first wireless technology by sendinga TxOP reservation message.
 7. The mobile communications device of claim1, wherein the controller module further rearranges the transmission ofsignals of the second wireless technology to end the transmission ofsignals of the second wireless technology prior to the starting of thedownlink transmission period of the first wireless technology by sendinga Reduced-InterFrame Space (RIFS) protection message.
 8. The mobilecommunications device of claim 1, wherein the controller module furtherrearranges the transmission of signals of the second wireless technologyto end the transmission of signals of the second wireless technologyprior to the starting of the downlink transmission period of the firstwireless technology by sending a physical layer control message.
 9. Themobile communications device of claim 1, wherein the control message isa clear-to-send-to-self (CTS2SELF) control message.
 10. The mobilecommunications device of claim 9, wherein the control message is sentwithin a predetermined slice time before the starting of the downlinktransmission period of the first wireless technology.
 11. A method fortransmission control in a mobile communications device supporting WiFicommunication and LTE communication, the method comprising: transmittinga control signal prior to the starting of an uplink period of the LTEcommunication to occupy the uplink transmission period of the LTEcommunication; and allowing the WiFi transmission to be performed duringthe occupied uplink transmission period of the LTE communication,wherein the method further comprises rearranging the WiFi transmissionto end the WiFi transmission prior to the starting of a downlinktransmission period of the LTE communication so as to receive anacknowledge (ACK) to activate a WiFi reception during the downlinktransmission period of the LTE communication.
 12. The method of claim11, wherein the rearranging step is performed by adjusting a packetstart time or a transmission data rate for the WiFi transmission. 13.The method of claim 11, wherein the rearranging step is performed byextending a packet transmission time for the WiFi transmission usingpadding delimiters.
 14. The method of claim 11, wherein the rearrangingstep is performed by configuring a Quiet duration with a duration datafor reserving the deferred starting time for further transmission. 15.The method of claim 11, wherein the rearranging step is performed bysending a TxOP reservation message.
 16. The method of claim 11, whereinthe rearranging step is performed by sending a sending aReduced-InterFrame Space (RIFS) protection message.
 17. The method ofclaim 11, wherein the rearranging step is performed by sending aphysical layer control message.
 18. The method of claim 11, wherein thecontrol message is a clear-to-send-to-self (CTS2SELF) control message.